As the White House issues a frightening National Climate Assessment reporting that global warming is real and that 'summers are longer and hotter...than any living American has ever experienced,' This week on Moyers & Company (check local listings), Bill Moyers talks with a scientist who has sounded the alarm for decades. For nearly 35 years, David Suzuki has brought science into the homes of millions on the Canadian television series, The Nature of Things. Along the way he has become a godfather of the environmental movement, and in a poll of his fellow Canadians last fall he was named that country's most admired figure. Nonetheless, his outspoken views on climate change and the government's collusion with the petrochemical industry in developing the Canada's oil-rich tar sands have made him the target of relentless attacks from his nation's prime minister, corporations, and right-wing ideologues. 'We've failed to shift the perceptual lenses through which we see our place on the plane